The circuit diagram shown here is of a 2 x 60 Watt stereo amplifier based on the LM4780 from National Semiconductors. LM4780 is a superb audio amplifier IC capable of delivering 60W Rms power output / channel into 8 ohm speakers. The LM4780 has very low total harmonic distortion (less than 0.5% at full output) and has a power supply rejection ration (PSRR) of 85 dB. The IC requires very few external components and has a built in mute facility. The LM4780 is completely protected using their trademark SPiKe technology and has a signal to noise ratio greater than 97dB. The circuit given here is well suitable for applications like components stereos, self powered speakers, home theatre systems, compact stereos etc.

Comments

Can you make full instructions and send to me i’m confused on the pins for the lm4780, switch with the 10 ohm resistor and the inputs A and B. How could i use a pententiometer to make a volume switch and could i use an audio jack female for the inputs?
Thanks

Hi Prakash connect 0 of trafo to common (shown as ground)of the amplifier. The heat sink should be a minimum 2mm thick 20cms by 10cms aluminum. for this size if you use an extruded alloy heat sink with fins will be the best.

Sir, as you said to place volume and tone controle before inputs a & b using preamplifier,but as this is stereo amplifier hence two preamplifiers must be used and this will cause pair of volume and tones control 1 for each channel. Which is not practical. Tell me sir what to do.
Probabily i didn’t understand what u said in previous post.

Hi Shubham LM4780 is a dual channel high power operational amplifier (with inverting and non inverting inputs similar to an operational amplifier). Input A & B should be connected through volume control. A pre-amplifier has to be used before this mail amplifier. Use the passive tone control appeared earlier which has got volume, bass treble controls.http://www.circuitstoday.com/passive-tone-control-circuit

Hi John
the PCB art work for dual side PCB is available on National Site. artwork to given to PCB manufacturer for requirement. not readily available in the market. visit following site.http://www.national.com/ds/LM/LM4780.pdf